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Monolithic Power Systems Inc. MP1528DQ-LF-Z
- Part No.:
- MP1528DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
MP1528DQ-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 950MA 6QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,557
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Product details
Overview
MP1528DQ-LF-Z from Monolithic Power Systems is a 36V precision white LED driver IC designed to drive up to nine series-connected white LEDs from a single-cell Li-ion battery (2.7V–36V input). It integrates a 0.63Ω power MOSFET, regulates LED current via a 0.4V full-scale FB threshold, supports analog/PWM brightness control, and includes open-load shutdown triggered at 40V BIAS voltage. Used in compact LCD backlighting for handheld cameras and PDA phones.
For engineers reviewing the MP1528DQ-LF-Z datasheet, MP1528DQ-LF-Z pinout, MP1528DQ-LF-Z application, or MP1528DQ-LF-Z equivalent, key selection factors include its 950mA internal current limit, 330ns minimum off-time control architecture, thermal shutdown at 160°C, QFN6 (3mm × 3mm) RoHS-compliant package, and dual-mode (analog 0.27–1.2V / PWM 100–400Hz) brightness interface.
Technical Context
The MP1528DQ-LF-Z employs a constant off-time, current-limited, variable-frequency boost converter architecture optimized for LED current regulation. Its feedback loop compares FB voltage against a 0.4V reference derived from BRT input (attenuated 1:3), enabling precise analog dimming across 0.27–1.2V.
Open-circuit protection is implemented by monitoring output voltage via the BIAS pin; shutdown occurs when BIAS exceeds 40V. Internal thermal shutdown (160°C) and under-voltage lockout (2.1–2.65V with 100mV hysteresis) ensure robust operation across –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Drive Capability | Up to 9 series white LEDs, supporting ≥36V output with 20mA nominal current per string. |
| Input Voltage Range | 2.7V to 36V - enables direct operation from single-cell Li-ion (3.0–4.2V) up to industrial 24V rails. |
| FB Regulation Threshold | 0.40V ±2% - sets LED current via external sense resistor (e.g., 20Ω yields 20mA). |
| Internal Power Switch RON | 0.63Ω - minimizes conduction loss at high current, critical for >90% efficiency at 20mA/9-LED load. |
| Current Limit | 950mA - protects inductor and switch during startup or shorted-LED fault conditions. |
| Open-Load Shutdown Threshold | 40V on BIAS pin - disables switching if LED string opens, preventing overvoltage damage to LEDs or components. |
| Thermal Shutdown | 160°C junction temperature - automatically halts operation to prevent permanent die damage. |
Pinout & Package
MP1528DQ-LF-Z is housed in a 6-pin QFN package (3mm × 3mm, exposed thermal pad), optimized for space-constrained portable designs. Pin numbering follows JEDEC MO-229 VEEA-2 standard with Pin 1 marked by index area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to bottom of LED string/sense resistor; regulates current by comparing voltage to 0.4V reference. |
| 2 GND | Power Ground | Primary return path for LED current, IC bias, and thermal pad; must be low-impedance and tied near C1/C2 grounds. |
| 3 SW | Switch Node Output | Drain of internal 0.63Ω MOSFET; connects to inductor and Schottky diode anode; swings from GND to ≥42V. |
| 4 BIAS | Output Voltage Monitor & Bias Supply | Connected to top of LED string for open-load detection; also powers internal circuitry - can tie to VIN if protection disabled. |
| 5 EN | Enable Control | Logic-level input (0.8–1.5V threshold); <0.4V disables IC (1µA shutdown current); never leave floating. |
| 6 BRT | Brightness Control | Analog dimming: 0.27–1.2V DC; PWM dimming: 100–400Hz signal with low <0.18V / high >1.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.63Ω Power MOSFET | Eliminates external switch, reduces board area and BOM count while maintaining >90% efficiency at 20mA/9-LED load. |
| 0.4V Full-Scale Current Sense Threshold | Enables use of low-value, low-power sense resistors (e.g., 20Ω @ 20mA = 8mW), minimizing heat and PCB footprint. |
| Analog + PWM Dual Brightness Interface | Supports both DC voltage (0.27–1.2V) and digital PWM (100–400Hz) control - simplifies integration with MCU GPIO or DAC outputs. |
| Open-Load Shutdown at 40V | Prevents uncontrolled voltage rise during LED string disconnection, protecting downstream components and ensuring system safety. |
| Soft-Start & Thermal Shutdown | Gradual output ramp-up avoids inrush current; 160°C thermal cutoff provides fail-safe protection without external sensors. |
Applications
| Digital Camera Backlight | PDA Phone Display |
|---|---|
|
Use Scenario: Driving 6–9 series white LEDs behind a 2.4"–3.5" color LCD in battery-powered digital cameras. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current with analog dimming synchronized to image capture mode. Use Value: Delivers stable 20mA per LED across 3.0–4.2V battery range, enabling consistent brightness and color fidelity during video recording. |
Use Scenario: Backlighting QVGA or VGA resolution LCDs in legacy PDA phones with limited PCB real estate. IC Role / Device Role / Timing Role: Single-chip LED driver providing PWM-dimming compatibility with baseband processor GPIOs. Use Value: QFN6 package (3mm × 3mm) and integrated MOSFET reduce solution size by >40% vs discrete boost + driver alternatives. |
| Handheld Computer Display | Small LCD Instrument Panel |
|
Use Scenario: Illuminating monochrome or color LCDs in ruggedized handheld computers used in field service applications. IC Role / Device Role / Timing Role: High-reliability LED driver with UVLO (2.1V) and thermal shutdown (160°C) for extended operation in varying ambient conditions. Use Value: Operates down to –40°C and withstands input transients up to 36V, ensuring backlight functionality in industrial-grade portable equipment. |
Use Scenario: Backlighting segmented or dot-matrix LCDs in medical or test equipment front panels requiring precise brightness grading. IC Role / Device Role / Timing Role: Precision current regulator with 0.4V FB threshold and <2% regulation tolerance for calibrated luminance levels. Use Value: Analog dimming linearity (0.27–1.2V → 0–100% current) enables smooth, flicker-free brightness adjustment across 10+ intensity steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1528DK-LF-Z | Same die, MSOP-8 package (150°C/W θJA); larger footprint, higher thermal resistance than QFN6. | Suitable for prototyping or layouts where hand-soldering or thermal relief is prioritized over miniaturization. | Select when thermal margin is sufficient and board assembly favors SOIC-compatible land patterns. |
| MP1528DG-LF-Z | Same die, QFN-8 (2mm × 2mm); lower θJA (80°C/W) than QFN6 but smaller pad area limits heat dissipation above 15mA. | Better suited for ultra-compact designs with moderate LED current (<15mA) and tight layout constraints. | Choose for highest density where 2mm × 2mm footprint is mandatory and peak current remains ≤15mA. |
Compared with MP1528DK-LF-Z and MP1528DG-LF-Z, the MP1528DQ-LF-Z offers optimal thermal performance (50°C/W θJA) and mechanical robustness in the 3mm × 3mm QFN, making it the preferred choice for production designs targeting 20mA/9-LED loads with minimal board area.
Availability
MP1528DQ-LF-Z is available at Aetrix Electronics and suitable for handheld computing, PDA phone display, and digital camera backlighting requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for MP1528DQ-LF-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP1528 product line targets portable backlighting applications, delivering integrated, thermally efficient LED drivers optimized for single-cell battery operation and compact form factors.
FAQ
What is the maximum number of white LEDs the MP1528DQ-LF-Z can drive?
The MP1528DQ-LF-Z is rated to drive up to nine (9) series-connected white LEDs, assuming typical forward voltage of ~3.2V per LED, resulting in a total forward voltage of ~28.8V - well within its 36V output capability and 40V open-load shutdown threshold.
Can the MP1528DQ-LF-Z operate from a 3.3V input source?
Yes - the MP1528DQ-LF-Z supports input voltages from 2.7V to 36V. At 3.3V input, it can still regulate 9-series white LEDs (requiring ~28.8V) using its boost architecture, provided inductor and diode ratings accommodate the required voltage step-up ratio and peak currents.
How does the BRT pin function in analog versus PWM dimming modes?
In analog mode, applying 0.27–1.2V to BRT directly sets LED current via internal 1:3 attenuation (e.g., 1.2V → 0.4V FB threshold → 20mA with 20Ω resistor). In PWM mode, a 100–400Hz square wave with low <0.18V and high >1.2V toggles full-on/full-off states proportionally to duty cycle.
Is external compensation required for stable operation?
No external compensation is required - the MP1528DQ-LF-Z uses a constant off-time control scheme with internal compensation. Stability is ensured with recommended 4.7–10µF input and 0.47–1µF output ceramic capacitors (X5R/X7R dielectric) and proper PCB layout per the datasheet guidelines.
What happens if the BIAS pin is left unconnected?
The BIAS pin must not be left floating. If open-load protection is not needed, BIAS should be connected to the input supply (VIN) to power internal circuitry and avoid undefined behavior. Leaving it unconnected risks improper regulation, failure to start, or erratic shutdown behavior.
Does the MP1528DQ-LF-Z support I²C or other digital interfaces?
No - the MP1528DQ-LF-Z provides only analog voltage and PWM signal inputs for brightness control. It lacks digital communication interfaces such as I²C, SPI, or SMBus; dimming and enable functions are strictly handled via EN and BRT pins.
What is the quiescent current in shutdown mode?
In shutdown mode (EN < 0.4V), the MP1528DQ-LF-Z draws only 1–3µA typical supply current, enabling ultra-low power state retention in battery-critical applications like always-on display indicators or standby backlight circuits.
MP1528DQ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 36V
- Current - Output / Channel:
- 950mA (Switch)
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-QFN (3x3)
MP1528DQ-LF-Z FAQ
1.How can I place an order for MP1528DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1528DQ-LF-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP1528DQ-LF-Z reliable?
The price and inventory of MP1528DQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1528DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1528DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1528DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1528DQ-LF-Z?
MP1528DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1528DQ-LF-Z order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP1528DQ-LF-Z?
For technical support, including MP1528DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1528DQ-LF-Z requirements.
6.How does Aetrix verify that MP1528DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1528DQ-LF-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP1528DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1528DQ-LF-Z?
All MP1528DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1528DQ-LF-Z, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP1528DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP1528DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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